<?php

class Lunar
{
    public $isleap;
    public $lunarDay;
    public $lunarMonth;
    public $lunarYear;
}

class Solar
{
    public $solarDay;
    public $solarMonth;
    public $solarYear;
}

class LunarSolarConverter
{
    /*
     * |----4位闰月|-------------13位1为30天，0为29天|
     * */

    public static $lunar_month_days =
        array(
            1887, 0x1694, 0x16aa, 0x4ad5, 0xab6, 0xc4b7, 0x4ae, 0xa56, 0xb52a,
            0x1d2a, 0xd54, 0x75aa, 0x156a, 0x1096d, 0x95c, 0x14ae, 0xaa4d, 0x1a4c, 0x1b2a, 0x8d55, 0xad4, 0x135a, 0x495d,
            0x95c, 0xd49b, 0x149a, 0x1a4a, 0xbaa5, 0x16a8, 0x1ad4, 0x52da, 0x12b6, 0xe937, 0x92e, 0x1496, 0xb64b, 0xd4a,
            0xda8, 0x95b5, 0x56c, 0x12ae, 0x492f, 0x92e, 0xcc96, 0x1a94, 0x1d4a, 0xada9, 0xb5a, 0x56c, 0x726e, 0x125c,
            0xf92d, 0x192a, 0x1a94, 0xdb4a, 0x16aa, 0xad4, 0x955b, 0x4ba, 0x125a, 0x592b, 0x152a, 0xf695, 0xd94, 0x16aa,
            0xaab5, 0x9b4, 0x14b6, 0x6a57, 0xa56, 0x1152a, 0x1d2a, 0xd54, 0xd5aa, 0x156a, 0x96c, 0x94ae, 0x14ae, 0xa4c,
            0x7d26, 0x1b2a, 0xeb55, 0xad4, 0x12da, 0xa95d, 0x95a, 0x149a, 0x9a4d, 0x1a4a, 0x11aa5, 0x16a8, 0x16d4,
            0xd2da, 0x12b6, 0x936, 0x9497, 0x1496, 0x1564b, 0xd4a, 0xda8, 0xd5b4, 0x156c, 0x12ae, 0xa92f, 0x92e, 0xc96,
            0x6d4a, 0x1d4a, 0x10d65, 0xb58, 0x156c, 0xb26d, 0x125c, 0x192c, 0x9a95, 0x1a94, 0x1b4a, 0x4b55, 0xad4,
            0xf55b, 0x4ba, 0x125a, 0xb92b, 0x152a, 0x1694, 0x96aa, 0x15aa, 0x12ab5, 0x974, 0x14b6, 0xca57, 0xa56, 0x1526,
            0x8e95, 0xd54, 0x15aa, 0x49b5, 0x96c, 0xd4ae, 0x149c, 0x1a4c, 0xbd26, 0x1aa6, 0xb54, 0x6d6a, 0x12da, 0x1695d,
            0x95a, 0x149a, 0xda4b, 0x1a4a, 0x1aa4, 0xbb54, 0x16b4, 0xada, 0x495b, 0x936, 0xf497, 0x1496, 0x154a, 0xb6a5,
            0xda4, 0x15b4, 0x6ab6, 0x126e, 0x1092f, 0x92e, 0xc96, 0xcd4a, 0x1d4a, 0xd64, 0x956c, 0x155c, 0x125c, 0x792e,
            0x192c, 0xfa95, 0x1a94, 0x1b4a, 0xab55, 0xad4, 0x14da, 0x8a5d, 0xa5a, 0x1152b, 0x152a, 0x1694, 0xd6aa,
            0x15aa, 0xab4, 0x94ba, 0x14b6, 0xa56, 0x7527, 0xd26, 0xee53, 0xd54, 0x15aa, 0xa9b5, 0x96c, 0x14ae, 0x8a4e,
            0x1a4c, 0x11d26, 0x1aa4, 0x1b54, 0xcd6a, 0xada, 0x95c, 0x949d, 0x149a, 0x1a2a, 0x5b25, 0x1aa4, 0xfb52,
            0x16b4, 0xaba, 0xa95b, 0x936, 0x1496, 0x9a4b, 0x154a, 0x136a5, 0xda4, 0x15ac
        );

    public static $solar_1_1 =
        array(
            1887, 0xec04c, 0xec23f, 0xec435, 0xec649, 0xec83e, 0xeca51, 0xecc46, 0xece3a,
            0xed04d, 0xed242, 0xed436, 0xed64a, 0xed83f, 0xeda53, 0xedc48, 0xede3d, 0xee050, 0xee244, 0xee439, 0xee64d,
            0xee842, 0xeea36, 0xeec4a, 0xeee3e, 0xef052, 0xef246, 0xef43a, 0xef64e, 0xef843, 0xefa37, 0xefc4b, 0xefe41,
            0xf0054, 0xf0248, 0xf043c, 0xf0650, 0xf0845, 0xf0a38, 0xf0c4d, 0xf0e42, 0xf1037, 0xf124a, 0xf143e, 0xf1651,
            0xf1846, 0xf1a3a, 0xf1c4e, 0xf1e44, 0xf2038, 0xf224b, 0xf243f, 0xf2653, 0xf2848, 0xf2a3b, 0xf2c4f, 0xf2e45,
            0xf3039, 0xf324d, 0xf3442, 0xf3636, 0xf384a, 0xf3a3d, 0xf3c51, 0xf3e46, 0xf403b, 0xf424e, 0xf4443, 0xf4638,
            0xf484c, 0xf4a3f, 0xf4c52, 0xf4e48, 0xf503c, 0xf524f, 0xf5445, 0xf5639, 0xf584d, 0xf5a42, 0xf5c35, 0xf5e49,
            0xf603e, 0xf6251, 0xf6446, 0xf663b, 0xf684f, 0xf6a43, 0xf6c37, 0xf6e4b, 0xf703f, 0xf7252, 0xf7447, 0xf763c,
            0xf7850, 0xf7a45, 0xf7c39, 0xf7e4d, 0xf8042, 0xf8254, 0xf8449, 0xf863d, 0xf8851, 0xf8a46, 0xf8c3b, 0xf8e4f,
            0xf9044, 0xf9237, 0xf944a, 0xf963f, 0xf9853, 0xf9a47, 0xf9c3c, 0xf9e50, 0xfa045, 0xfa238, 0xfa44c, 0xfa641,
            0xfa836, 0xfaa49, 0xfac3d, 0xfae52, 0xfb047, 0xfb23a, 0xfb44e, 0xfb643, 0xfb837, 0xfba4a, 0xfbc3f, 0xfbe53,
            0xfc048, 0xfc23c, 0xfc450, 0xfc645, 0xfc839, 0xfca4c, 0xfcc41, 0xfce36, 0xfd04a, 0xfd23d, 0xfd451, 0xfd646,
            0xfd83a, 0xfda4d, 0xfdc43, 0xfde37, 0xfe04b, 0xfe23f, 0xfe453, 0xfe648, 0xfe83c, 0xfea4f, 0xfec44, 0xfee38,
            0xff04c, 0xff241, 0xff436, 0xff64a, 0xff83e, 0xffa51, 0xffc46, 0xffe3a, 0x10004e, 0x100242, 0x100437,
            0x10064b, 0x100841, 0x100a53, 0x100c48, 0x100e3c, 0x10104f, 0x101244, 0x101438, 0x10164c, 0x101842, 0x101a35,
            0x101c49, 0x101e3d, 0x102051, 0x102245, 0x10243a, 0x10264e, 0x102843, 0x102a37, 0x102c4b, 0x102e3f, 0x103053,
            0x103247, 0x10343b, 0x10364f, 0x103845, 0x103a38, 0x103c4c, 0x103e42, 0x104036, 0x104249, 0x10443d, 0x104651,
            0x104846, 0x104a3a, 0x104c4e, 0x104e43, 0x105038, 0x10524a, 0x10543e, 0x105652, 0x105847, 0x105a3b, 0x105c4f,
            0x105e45, 0x106039, 0x10624c, 0x106441, 0x106635, 0x106849, 0x106a3d, 0x106c51, 0x106e47, 0x10703c, 0x10724f,
            0x107444, 0x107638, 0x10784c, 0x107a3f, 0x107c53, 0x107e48
        );

    public static function GetBitInt($data, $length, $shift)
    {
        return ($data & (((1 << $length) - 1) << $shift)) >> $shift;
    }

    //WARNING: Dates before Oct. 1582 are inaccurate
    public static function SolarToInt($y, $m, $d)
    {
        $m = ($m + 9) % 12;
        $y = intval($y) - intval($m / 10);
        return intval(365 * $y + intval($y / 4) - intval($y / 100) + intval($y / 400) + intval(($m * 306 + 5) / 10) + ($d - 1));
    }

    public static function SolarFromInt($g)
    {
        $y = intval((10000 * intval($g) + 14780) / 3652425);
        $ddd = intval($g - (365 * $y + intval($y / 4) - intval($y / 100) + intval($y / 400)));
        if ($ddd < 0) {
            $y--;
            $ddd = intval($g - (365 * $y + intval($y / 4) - intval($y / 100) + intval($y / 400)));
        }
        $mi = intval((100 * $ddd + 52) / 3060);
        $mm = intval(($mi + 2) % 12 + 1);
        $y = (int)$y + intval(($mi + 2) / 12);
        $dd = intval($ddd - intval(($mi * 306 + 5) / 10) + 1);
        $solar = new Solar();
        $solar->solarYear = (int)$y;
        $solar->solarMonth = (int)$mm;
        $solar->solarDay = (int)$dd;
        return $solar;
    }

    public static function LunarToSolar($lunar)
    {
        $days = LunarSolarConverter::$lunar_month_days[$lunar->lunarYear - LunarSolarConverter::$lunar_month_days[0]];
        $leap = LunarSolarConverter::GetBitInt($days, 4, 13);
        $offset = 0;
        $loopend = $leap;
        if (!$lunar->isleap) {
            if ($lunar->lunarMonth <= $leap || $leap == 0) {
                $loopend = $lunar->lunarMonth - 1;
            } else {
                $loopend = $lunar->lunarMonth;
            }
        }
        for ($i = 0; $i < $loopend; $i++) {
            $offset += LunarSolarConverter::GetBitInt($days, 1, 12 - $i) == 1 ? 30 : 29;
        }
        $offset += $lunar->lunarDay;

        $solar11 = LunarSolarConverter::$solar_1_1[$lunar->lunarYear - LunarSolarConverter::$solar_1_1[0]];

        $y = LunarSolarConverter::GetBitInt($solar11, 12, 9);
        $m = LunarSolarConverter::GetBitInt($solar11, 4, 5);
        $d = LunarSolarConverter::GetBitInt($solar11, 5, 0);

        return LunarSolarConverter::SolarFromInt(LunarSolarConverter::SolarToInt($y, $m, $d) + $offset - 1);
    }

    public static function SolarToLunar($solar)
    {
        $lunar = new Lunar();
        $index = $solar->solarYear - LunarSolarConverter::$solar_1_1[0];
        $data = ($solar->solarYear << 9) | ($solar->solarMonth << 5) | ($solar->solarDay);
        if (LunarSolarConverter::$solar_1_1[$index] > $data) {
            $index--;
        }
        $solar11 = LunarSolarConverter::$solar_1_1[$index];
        $y = LunarSolarConverter::GetBitInt($solar11, 12, 9);
        $m = LunarSolarConverter::GetBitInt($solar11, 4, 5);
        $d = LunarSolarConverter::GetBitInt($solar11, 5, 0);
        $offset = LunarSolarConverter::SolarToInt($solar->solarYear, $solar->solarMonth, $solar->solarDay) - LunarSolarConverter::SolarToInt($y, $m, $d);

        $days = LunarSolarConverter::$lunar_month_days[$index];
        $leap = LunarSolarConverter::GetBitInt($days, 4, 13);

        $lunarY = $index + LunarSolarConverter::$solar_1_1[0];
        $lunarM = 1;
        $offset += 1;

        for ($i = 0; $i < 13; $i++) {
            $dm = LunarSolarConverter::GetBitInt($days, 1, 12 - $i) == 1 ? 30 : 29;
            if ($offset > $dm) {
                $lunarM++;
                $offset -= $dm;
            } else {
                break;
            }
        }
        $lunarD = intval($offset);
        $lunar->lunarYear = $lunarY;
        $lunar->lunarMonth = $lunarM;
        $lunar->isleap = false;
        if ($leap != 0 && $lunarM > $leap) {
            $lunar->lunarMonth = $lunarM - 1;
            if ($lunarM == $leap + 1) {
                $lunar->isleap = true;
            }
        }

        $lunar->lunarDay = $lunarD;
        return $lunar;
    }
}




